Narrative:The Avro York plane carried out a freight flight from Beirut to Tehran via Kuwait. On the Kuwait-Tehran leg of the flight several test manoeuvres were carried out by a check pilot who was examining the pilot in command and co-pilot for renewal of their licenses.
The flight arrived at Tehran at 17:40 GMT and departed Tehran again at 05:30 GMT. The crew didn't report when 25 miles out as requested; it appeared the plane had crashed 16 miles W of the airport.
PROBABLE CAUSE: "The position of the propellers at the time of impact would indicate that, at a time when the no. 4 engine power was off, an emergency condition developed which necessitated the feathering of no. 3 engine and the unfeathering of no. 4. Alternatively, a loss of power on the starboard engines could have occurred from an erroneous manipulation of the feathering switches during the course of this assumed crew checking exercise. In view of the fact that the fully loaded aircraft was flying at a low altitude after taking off from Mehrabad Airport which has an elevation of 3900 feet, it is evident that at the aircraft would not have sufficient altitude for the pilot to take effective recovery action and so avoid a crash resulting from the above mentioned loss-of-power conditions."
» ICAO Accident Digest No.15 - Volume II, Circular 78-AN/66 (29-33)
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not
display the exact flight path.
Distance from Tehran-Mehrabad Airport to Beirut International Airport as the crow flies is 1449 km (906 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.